Reversible Black Tropical Blossom Outdoor Deep Seat Cushion Set Seat dimensions: 24 in. D x 24 in. W x 5.75 in. T. Back dimensions: 22.5 in. D x 25 in. W x 6.5 in. T. Durable outdoor 100% polyester fabric is UV treated to resist fading for longer lasting vibrant color. 100% polyester filled pillow back and seat cushion a superior poly-fill that helps cushion retain shape over time.